Re: PFC Question

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx>

Hi Gerry,

Well, that's EXACTLY the way that I had it wired
in the first place when I was having the resonance problem that I was 
talking about that started this thread. So since I have enough power 
and current available to run my coil without concern of popping 
breakers, I think that I'll just scrap the PFC idea as my coil has 
been working fine without it so far anyhow.

David Rieben

----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Thursday, November 03, 2005 10:08 PM
Subject: Re: PFC Question


> Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
> Hi David,
> No.  The ballast needs to be "down stream" from the PFC caps.  You 
> need to form a parallel LC circuit so the leading current in the PFC 
> caps cancels the lagging current in the ballast.  If you put the PFC 
> caps across the pig with the ballast upstream, you will form a 
> series LC circuit that at resonse will form a low impedance and 
> increase the current draw.  Parallel LC circuits at resonance form a 
> high reactive impedance to the variac output so the only draw will 
> be the "real" current.  Put the PFC directly on the variac output 
> and have this output feed the ballast in series with the pig.
> Gerry R.
>
> > Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx>
> >
> > the variac. So if I were so inclined to reinstall the PFCs, they 
> > would need to go DIRECTLY across and in parallel
> > with the 240 volt input lugs of the pig, right? That should
> > remove the seriesed ballast L from the picture. I may try
> > temporarily connecting the caps directly across the input
> > lugs of the pole pig and see if that makes any difference.
> >
> > David Rieben
> >
> >
> > ----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
> > To: <tesla@xxxxxxxxxx>
> > Sent: Thursday, November 03, 2005 9:40 AM
> > Subject: Re: PFC Question
> >
> >
> > > Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
> > > Hi David,
> > > Where is your ballast if the output of the variac is connected 
> > > directly to the input of your PIG.
> > > Gerry R.
> > >
> > > > Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx>
> > > >
> > > > Hi Ed,
> > > >
> > > > I must not have explained myself properly.
> > > > My PFC caps were directly across the out-
> > > > put terminals of the variac and consequently
> > > > across the input terminals to the transformer.
> > > > That's in parallel with the input terminnals of
> > > > the transformer, isn't it? And the variac would
> > > > start the resonant saturation hum even with the trans-
> > > > former disconnected from it, or with no load.
> > > > I even tried removing one of the 100 uFd
> > > > caps to make it 600 uFd PFC but that didn't
> > > > really seem to help so at that point, I just decided
> > > > remove them altogether.
> > > >
> > > > David Rieben